I bought a 135 gallon aquarium with wood stand, wood canopy top, Rena Filstar XP4 canister filter, 300 watt heater, river rock substrate and lava rock. Its a nice tank but has this mildew/mold on the light strip and the inside of the canopy top, because the previous owner never used any hoods with this tank. It also has this thin film on the inside of the glass that makes the tank look murky and not crystal clear. I've been taking a straight edged razor to it, but it still doesn't come off completely in some spots. Is there any type of cleaner I can use to help get this mold off the canopy/light strip and film off the inside glass of the tank? Any tips are appreciated as this straight edge razor thing takes a very long time.

Oh yea, I plan on throwing some cichlids in this tank. Maybe some oscars, angel fish, jack dempseys, convicts, you know something along these lines.

You could try filling the tank with water to loosen the stuff up, which might make it able to be removed with just an algae brush or at least with less effort from the razor. You could also try vinegar since the film could be hard water residue.

That fish stocking sounds fine but I wouldn't mix angels with those more aggressive cichlids.

+one for vinegar and perhaps scotchbrite pad and or clean bristle brush . Vinegar is a weak acid that is very good at removing calcium or hardwater stains. Be sure and rinse that which you clean very good before filling the tank for fish.
Some stains just never seem to go away and in these instances ,I sometimes fill the tank with water until it covers the stained area and then see if it isn't less noticeable. Have had stains that were near invisible once the tank was filled.
Have also used a paste used by Jeweler's to polish jewelry on some tanks to polish the glass as well as clean it. Maybe a jeweler in your area could help?

Ive tryed vinegar before and it does work a little bit. What about the mold/mildew on the light strip? Should I also use vinegar? I was thinking something more to help disinfect it because I don't want to be breathing this stuff in you know? Someone told me rubbing alcohol or even bleach are OK for the lightstrip because they evaporate after a while, but I don't want to use these strong chemicals without a second opinion.

What I did was take all the rock outta the tank completely, then rinsed the tank all out to make sure there wasn't any specks of gravel what so ever. After this I dried it with some towels and made sure it was completely dry. I then laid the tank down on the side that needed cleaning.

Next, I took an old spray bottle that didn't have any chemicals prior to its use, and put vinegar in it. I then sprayed it on the one side that the tank is now laying on and let it soak a little bit. After this I took a green scrubbing pad and scrubbed it with the vinegar. If it all didn't come off, I sprayed the spots that needed to be sprayed and repeat the steps. Some spots took me about 5 times.

When I got done with the scrubbing part, I took a damp wash cloth and wiped the glass panel, then I used a dry towel and wiped it dry.

After this I turned the tank over on its other side and did the next side. Keep in mind that you really do have to let that vinegar soak, and when you think its doing nothing you just have to be patient. This probably took me a good 4 or 5 hours.

Oh yea, it also didn't take the hard water stains completely off, but it made a noticeable difference. It was great for the murky stains though.

OK, so now I want to try and eliminate these lime buildup stains completely. What do you guys think about lemon or lime juice to take them away? I looked at the pH chart and lime juice is more acidic than vinegar, but is it too harsh? I don't want to harm my future fish, or weaken my silicone that holds the glass panels together. I mean, it sounds good though right....lime to take away lime buildup. haha Let me know, I love input

Oh yea, the light strip is plastic and the canopy top is like a cherry wood with a nice finish, it matches the stand. Both have mold/mildew, and I haven't even gotten to them yet! They aren't really a rush because I need to get some glass hoods before I use them probably anyways, to prevent it from happening again you know.

OK, so now I want to try and eliminate these lime buildup stains completely. What do you guys think about lemon or lime juice to take them away? I looked at the pH chart and lime juice is more acidic than vinegar, but is it too harsh? I don't want to harm my future fish, or weaken my silicone that holds the glass panels together. I mean, it sounds good though right....lime to take away lime buildup. haha Let me know, I love input

Would not use any acid stronger than vinegar for reasons you have already noted (silicone seals).

OK, so how long until I can put fish into this tank? I rinsed it for about 10 minutes in the back yard with the hose. Should I let it sit with water for a day and drain it a couple times to be on the safe side?